NFFT
3.4.1
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NFFT-based discrete Radon transform. More...
#include <stdio.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <complex.h>
#include "nfft3mp.h"
Go to the source code of this file.
Macros | |
#define | NFFT_PRECISION_DOUBLE |
#define | KERNEL(r) (NFFT_K(1.0)-NFFT_M(fabs)((NFFT_R)(r))/((NFFT_R)S/2)) |
define weights of kernel function for discrete Radon transform | |
Functions | |
static int | polar_grid (int T, int S, NFFT_R *x, NFFT_R *w) |
generates the points x with weights w for the polar grid with T angles and R offsets | |
static int | linogram_grid (int T, int S, NFFT_R *x, NFFT_R *w) |
generates the points x with weights w for the linogram grid with T slopes and R offsets | |
static int | Radon_trafo (int(*gridfcn)(), int T, int S, NFFT_R *f, int NN, NFFT_R *Rf) |
computes the NFFT-based discrete Radon transform of f on the grid given by gridfcn() with T angles and R offsets | |
int | main (int argc, char **argv) |
simple test program for the discrete Radon transform | |
NFFT-based discrete Radon transform.
Computes the discrete Radon transform
by taking the 2D-NFFT of ( ) at the points of the polar or linogram grid followed by 1D-iFFTs for every direction , where are the weights of the Dirichlet- or Fejer-kernel.
Definition in file radon.c.